This report provides and overview of the efforts undertaken by the Long-Term Pavement Program (LTTP) in 1999. Pavements are where the proverbial rubber meets the road. They are at the core of the Nation's highway transportation system's infrastructure. To better understand pavement performance, LTPP gathers and processes data describing the structure, service conditions, and performance of more than 2,400 pavement test sections in all 50 States, the District of Columbia, Puerto Rico, and the 10 Canadian Provinces. In 1999, this information helped the program to update two of its key products – DataPave and LTPPBind. With the new versions of these software packages, highway engineers will now have more data to help them make decisions that lead to more cost-effective and better performing pavements. LTPP also launched the final stage of its Data Resolution effort by implementing data monitoring adjustments. With these adjustments, the States, Provinces, and FHWA can allocate financial and human resources more effectively.